The writer plans to turn his novel ‘Porno’ into a follow-up of the iconic 1996 Scottish when he meets up with its producer and script-writer in spring.

There were worries Ewan McGregor, who played junkie Renton in the original, wouldn’t take part unless the storyline made him the star, while director Danny Boyle said he thought the actors had become too clean-cut.

But Welsh insisted in a weekend interview that he will make it happen by writing “the killer script.”

He’s meeting Trainspotting’s producer Andrew Macdonald and scriptwriter John Hodge to work on part-two.

He said: “Andrew, John and myself are going to make Trainspotting 2 happen.

“We’ve agreed to go away in the spring and sit down for a couple of days to knock out a screenplay.

“The idea is we’ll get a good screenplay and pass that onto Trainspotting director Danny Boyle, and if he likes it we’ll look at ways to raise money to get the actors on board.”

The original film followed the lives of a group of Edinburgh heroin addicts and became an instant hit when it was released in 1996.

Many of the stellar cast, which included Jonny Lee Miller, Robert Carlyle and Kelly Macdonald, went on to carve out a successful film careers.

After the film’s surprise success, Macdonald and Boyle went on to produce a string of films together, including The Beach and 28 Days Later, while McGregor became a superstar even before his central role in Star Wars.

But McGregor will take some convincing to agree to act as Renton again, after slating the Porno novel in an outburst in 2007.

He said: “I would be loath to do anything that would damage Trainspotting.

“I love it too much to make a poor sequel and I didn’t think the follow-up to the book was that good.”

Further doubt was cast on a sequel in November when film maker Danny Boyle said the actors had become too dapper in their millionaire lifestyles to play drug addicts.